1 // SPDX-License-Identifier: GPL-2.0 2 /* sbuslib.c: Helper library for SBUS framebuffer drivers. 3 * 4 * Copyright (C) 2003 David S. Miller (davem@redhat.com) 5 */ 6 7 #include <linux/compat.h> 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/string.h> 11 #include <linux/fb.h> 12 #include <linux/mm.h> 13 #include <linux/uaccess.h> 14 #include <linux/of_device.h> 15 16 #include <asm/fbio.h> 17 18 #include "sbuslib.h" 19 20 void sbusfb_fill_var(struct fb_var_screeninfo *var, struct device_node *dp, 21 int bpp) 22 { 23 memset(var, 0, sizeof(*var)); 24 25 var->xres = of_getintprop_default(dp, "width", 1152); 26 var->yres = of_getintprop_default(dp, "height", 900); 27 var->xres_virtual = var->xres; 28 var->yres_virtual = var->yres; 29 var->bits_per_pixel = bpp; 30 } 31 32 EXPORT_SYMBOL(sbusfb_fill_var); 33 34 static unsigned long sbusfb_mmapsize(long size, unsigned long fbsize) 35 { 36 if (size == SBUS_MMAP_EMPTY) return 0; 37 if (size >= 0) return size; 38 return fbsize * (-size); 39 } 40 41 int sbusfb_mmap_helper(struct sbus_mmap_map *map, 42 unsigned long physbase, 43 unsigned long fbsize, 44 unsigned long iospace, 45 struct vm_area_struct *vma) 46 { 47 unsigned int size, page, r, map_size; 48 unsigned long map_offset = 0; 49 unsigned long off; 50 int i; 51 52 if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE))) 53 return -EINVAL; 54 55 size = vma->vm_end - vma->vm_start; 56 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 57 return -EINVAL; 58 59 off = vma->vm_pgoff << PAGE_SHIFT; 60 61 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */ 62 63 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 64 65 /* Each page, see which map applies */ 66 for (page = 0; page < size; ){ 67 map_size = 0; 68 for (i = 0; map[i].size; i++) 69 if (map[i].voff == off+page) { 70 map_size = sbusfb_mmapsize(map[i].size, fbsize); 71 #ifdef __sparc_v9__ 72 #define POFF_MASK (PAGE_MASK|0x1UL) 73 #else 74 #define POFF_MASK (PAGE_MASK) 75 #endif 76 map_offset = (physbase + map[i].poff) & POFF_MASK; 77 break; 78 } 79 if (!map_size) { 80 page += PAGE_SIZE; 81 continue; 82 } 83 if (page + map_size > size) 84 map_size = size - page; 85 r = io_remap_pfn_range(vma, 86 vma->vm_start + page, 87 MK_IOSPACE_PFN(iospace, 88 map_offset >> PAGE_SHIFT), 89 map_size, 90 vma->vm_page_prot); 91 if (r) 92 return -EAGAIN; 93 page += map_size; 94 } 95 96 return 0; 97 } 98 EXPORT_SYMBOL(sbusfb_mmap_helper); 99 100 int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg, 101 struct fb_info *info, 102 int type, int fb_depth, unsigned long fb_size) 103 { 104 switch(cmd) { 105 case FBIOGTYPE: { 106 struct fbtype __user *f = (struct fbtype __user *) arg; 107 108 if (put_user(type, &f->fb_type) || 109 put_user(info->var.yres, &f->fb_height) || 110 put_user(info->var.xres, &f->fb_width) || 111 put_user(fb_depth, &f->fb_depth) || 112 put_user(0, &f->fb_cmsize) || 113 put_user(fb_size, &f->fb_cmsize)) 114 return -EFAULT; 115 return 0; 116 } 117 case FBIOPUTCMAP_SPARC: { 118 struct fbcmap __user *c = (struct fbcmap __user *) arg; 119 struct fb_cmap cmap; 120 u16 red, green, blue; 121 u8 red8, green8, blue8; 122 unsigned char __user *ured; 123 unsigned char __user *ugreen; 124 unsigned char __user *ublue; 125 unsigned int index, count, i; 126 127 if (get_user(index, &c->index) || 128 get_user(count, &c->count) || 129 get_user(ured, &c->red) || 130 get_user(ugreen, &c->green) || 131 get_user(ublue, &c->blue)) 132 return -EFAULT; 133 134 cmap.len = 1; 135 cmap.red = &red; 136 cmap.green = &green; 137 cmap.blue = &blue; 138 cmap.transp = NULL; 139 for (i = 0; i < count; i++) { 140 int err; 141 142 if (get_user(red8, &ured[i]) || 143 get_user(green8, &ugreen[i]) || 144 get_user(blue8, &ublue[i])) 145 return -EFAULT; 146 147 red = red8 << 8; 148 green = green8 << 8; 149 blue = blue8 << 8; 150 151 cmap.start = index + i; 152 err = fb_set_cmap(&cmap, info); 153 if (err) 154 return err; 155 } 156 return 0; 157 } 158 case FBIOGETCMAP_SPARC: { 159 struct fbcmap __user *c = (struct fbcmap __user *) arg; 160 unsigned char __user *ured; 161 unsigned char __user *ugreen; 162 unsigned char __user *ublue; 163 struct fb_cmap *cmap = &info->cmap; 164 unsigned int index, count, i; 165 u8 red, green, blue; 166 167 if (get_user(index, &c->index) || 168 get_user(count, &c->count) || 169 get_user(ured, &c->red) || 170 get_user(ugreen, &c->green) || 171 get_user(ublue, &c->blue)) 172 return -EFAULT; 173 174 if (index > cmap->len || count > cmap->len - index) 175 return -EINVAL; 176 177 for (i = 0; i < count; i++) { 178 red = cmap->red[index + i] >> 8; 179 green = cmap->green[index + i] >> 8; 180 blue = cmap->blue[index + i] >> 8; 181 if (put_user(red, &ured[i]) || 182 put_user(green, &ugreen[i]) || 183 put_user(blue, &ublue[i])) 184 return -EFAULT; 185 } 186 return 0; 187 } 188 default: 189 return -EINVAL; 190 } 191 } 192 EXPORT_SYMBOL(sbusfb_ioctl_helper); 193 194 #ifdef CONFIG_COMPAT 195 int sbusfb_compat_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) 196 { 197 switch (cmd) { 198 case FBIOGTYPE: 199 case FBIOSATTR: 200 case FBIOGATTR: 201 case FBIOSVIDEO: 202 case FBIOGVIDEO: 203 case FBIOSCURSOR32: 204 case FBIOGCURSOR32: /* This is not implemented yet. 205 Later it should be converted... */ 206 case FBIOSCURPOS: 207 case FBIOGCURPOS: 208 case FBIOGCURMAX: 209 return info->fbops->fb_ioctl(info, cmd, arg); 210 case FBIOPUTCMAP32: 211 case FBIOPUTCMAP_SPARC: { 212 struct fbcmap32 c; 213 struct fb_cmap cmap; 214 u16 red, green, blue; 215 u8 red8, green8, blue8; 216 unsigned char __user *ured; 217 unsigned char __user *ugreen; 218 unsigned char __user *ublue; 219 unsigned int i; 220 221 if (copy_from_user(&c, compat_ptr(arg), sizeof(c))) 222 return -EFAULT; 223 ured = compat_ptr(c.red); 224 ugreen = compat_ptr(c.green); 225 ublue = compat_ptr(c.blue); 226 227 cmap.len = 1; 228 cmap.red = &red; 229 cmap.green = &green; 230 cmap.blue = &blue; 231 cmap.transp = NULL; 232 for (i = 0; i < c.count; i++) { 233 int err; 234 235 if (get_user(red8, &ured[i]) || 236 get_user(green8, &ugreen[i]) || 237 get_user(blue8, &ublue[i])) 238 return -EFAULT; 239 240 red = red8 << 8; 241 green = green8 << 8; 242 blue = blue8 << 8; 243 244 cmap.start = c.index + i; 245 err = fb_set_cmap(&cmap, info); 246 if (err) 247 return err; 248 } 249 return 0; 250 } 251 case FBIOGETCMAP32: { 252 struct fbcmap32 c; 253 unsigned char __user *ured; 254 unsigned char __user *ugreen; 255 unsigned char __user *ublue; 256 struct fb_cmap *cmap = &info->cmap; 257 unsigned int index, i; 258 u8 red, green, blue; 259 260 if (copy_from_user(&c, compat_ptr(arg), sizeof(c))) 261 return -EFAULT; 262 index = c.index; 263 ured = compat_ptr(c.red); 264 ugreen = compat_ptr(c.green); 265 ublue = compat_ptr(c.blue); 266 267 if (index > cmap->len || c.count > cmap->len - index) 268 return -EINVAL; 269 270 for (i = 0; i < c.count; i++) { 271 red = cmap->red[index + i] >> 8; 272 green = cmap->green[index + i] >> 8; 273 blue = cmap->blue[index + i] >> 8; 274 if (put_user(red, &ured[i]) || 275 put_user(green, &ugreen[i]) || 276 put_user(blue, &ublue[i])) 277 return -EFAULT; 278 } 279 return 0; 280 } 281 default: 282 return -ENOIOCTLCMD; 283 } 284 } 285 EXPORT_SYMBOL(sbusfb_compat_ioctl); 286 #endif 287